Counterweight means for crank shafts and process of forming and attaching



March 12, 1929. H. H. KEEPORTS 1,705,187

' coumsnwmem mums FOR 01mm SHAFTS 1mm OF g 1 F 1920 PROCESS FORMING AND ATTCHING ina iled May 27,

awuwwtoz HARRY H. KEE PORT'J WU I Patented Mar. 12, 1929.

UNITED, sTA Es 1,705,187 PATENT OFFICE;

HARRY 1r. KEEPORTS, or CANTON, OHIO; THE eno. o. 'HARTER. BANK, or cannon, OHIO,

ADMINISTRATOR OF SAID HARRY I-I. KEEPORTS, (DECEASED), ASSIGNOR, BY MESNE ASSIGNMENTS, TO B. WICKIIIFFETWYMAN, OFIVIILWAUKEE, WISCONSIN.

COUNTERWEIGHT MEANS FOR CRANK SHAFTS AND PROCESS OF FORMING ATTACHING.

AND

Ap Iicati-on filed May 27, 1920, Serial No. 384,776. Renewed'August 13, 1928.

This invention relates to improved counterweight means for crank shafts for automobile engines or the like, and to the process of forging and attaching the same. 7

The obj eots of the invention are to provide an effective counterweight which can be readily and economically applied in the process of manufacture and be securely held on the crank shaft of an automobile or the like.

Objects relating to details and economies of Construction and operation will definitely appear from the detailed description to follow.

' throws with my improved counterweight in place. I l

Fig. II is a detail sectional elevation new on line 22 of Fig. I, showing the details of construction and method of forging and application.

Fig. III is a detail transverse sectional view throu 'h the counterweight and connecting head t erefor, on line 33 of Figs. I and II.

In the drawing similar reference characters refer to similar parts throughout the several views, and the'sectional views are takenlooking in the direction of the little arrows at the ends of the section lines.

Considering the numbered parts of the drawing, 1 is the crank shaft having a throw 2. A counterweight 3 is formed with proj ecting engaging portions 3 3 which are conformed on their inner surfaces to the extended head a on the crank shaft opposite the throw. A shallow groove 5 is formed around this head to which the engaging part of the counterweight conforms, as seen in Fig. III. A clearance groove 7 is also made on the counterweight opposite the center of the head 4 (Fig. I). This produces a structure which can be very readily drop forged. The groove 5 can be very readily shaped with the clearance 6, and a counterweight 3 can be very readily drop forged in the shape in which it appears,

with one portion around 3 bent outwardly, as indicated by the dotted lines in Fig. II.

When the crank shaft has been forged with the projecting head 4 thereon, the counter weight 3 is brought into position and the part indicated by the dotted lines is forced into position by any suitable means, thereby securing a very ti ht and effective joint; The parts might be closed coldbut it is better that same should be shrunk on. The metal Where trimmed has plenty of clearance and opportunity-to-seat itself, owing to the clearance spaces 6 and 7.

Of course, the counterweight 3 and the groove 5 and'the shaped projections of head 4 can be located anywhere on the crank shaft webs or arms and made any shape, as long as the surfaces interlock when in place to'prevent the counterweight from loosening or coming off in use. It is also possible to forge both counterweight portions 3 open and close onto the projections of head 4.

I have shown my invention in the specific form preferred by me, and I desire to claim the same specifically. I desire also to claim the invention broadly, as pointed out in the appended claims.

Having thus described my invention, what I claim as new and desire to secure-by Letters Patent is:

1. A counter-weighted crank shaft consisting of-the combination of a grooved projecting head portion at the inner end of the Gran throw, with engaging portions thereon and a grooved surface around its periphery, and a counterweight conformed to the grooved surface to surround the periphery and closed and shrunk to position thereon.

2. A counterweighted crank shaft consisting of the combination of a groovedportion at the inner end of the crank throw, with engag-' ing portions thereon and a grooved surface,

and a counterweight conformed to the grooved surface and closed and shrunk to position thereon.

3. The process of forming a counterweight for a crank shaft consisting of forming interlocking shapes on the said shaft. and weight, the shape on the weight being in open position, and thereafter closing and shrinking the weight in place.

4.. The herein described method of securing counter-Weight, heating the counter-Weight, 1

and applying the counterweight to the anchoring head and squeezing it into interlocking engagement therewith and permitting it to shrink thereon.

In Witness whereof, Ihave hereunto set my 1 hand;

' HARRY H. KEEPORTS. 

